05000321/LER-1980-018-03, /03L-0:on 800207,during Normal,Full Power Operation,Hydraulic Control Unit Accumulator 42-23 Received Low Pressure Alarm.Caused by Failure of Nitrogen Cartridge Valve from Wear Due to Constant Use

/03L-0:on 800207,during Normal,Full Power Operation,Hydraulic Control Unit Accumulator 42-23 Received Low Pressure Alarm.Caused by Failure of Nitrogen Cartridge Valve from Wear Due to Constant Use

ML19296D429
Person / Time
Site:	Hatch
Issue date:	02/25/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19296D424	List: 05000321/LER-1980-018, Forwards LER 80-018/03L-0 05000321/LER-1980-018-03, /03L-0:on 800207,during Normal,Full Power Operation,Hydraulic Control Unit Accumulator 42-23 Received Low Pressure Alarm.Caused by Failure of Nitrogen Cartridge Valve from Wear Due to Constant Use
References
LER-80-018-03L, LER-80-18-3L, NUDOCS 8003040572
Download: ML19296D429 (2)

LER-1980-018, /03L-0:on 800207,during Normal,Full Power Operation,Hydraulic Control Unit Accumulator 42-23 Received Low Pressure Alarm.Caused by Failure of Nitrogen Cartridge Valve from Wear Due to Constant Use

Event date:
Report date:
3211980018R03 - NRC Website

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m oi?i i alarn was received.

The acctmulctor was determined ta_!Le ingpftr.Able-CRD 34-27 had I

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nARPATI'!E REPCRT G~org:, Power Cerany Plant I. Hatch Baxli;, Georgia 3!513 Repo rtable Occurrence Report t'o.

50-321/1980-018 at 19C1 CST on 2-7-80, a low nressure alarm was received on HCU accumulator 42-22.

Uoon investigatien it was discovered that the accumulator would not hold a nitrocen charge due to a leaking cartridge valve (EP 111) on the ac-cu.uiator nitrogen charging mechanism.

Tech Snecs section 3.3.B.'.4 states that at least 4 operable control rods must separate any 2 inoperabi'e ones.

If this cannot be met, the unit must be brought to cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Control rod 34-27 had been inoperable by Tech Specs since 1-30-80, due to a charging water valve which

',t coen and which must he repaired in cold shutdown.

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-7-E]. tne cartricce valve was replaced, and the accumulator cn i r' o n tn nitrocen.

Inis fulfilled the Tech Specs requirements, and shut-m o not necessary.

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2:::ination, tne valve failure was determined to have been caused by s

ey.cm-i/e packing wear.

This event is neither a repetitive nor a generic

' n i c 2 was unaf fected.

The unit is now in full compliance, occur 2nce.

u and no furtner reporting is required.